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Designation: C 36/C 36M 99e1

Standard Specification forGypsum Wallboard1

This standard is issued under the fixed designation C 36/C 36M; the number immediately following the designation indicates the year

of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.

A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

This standard has been approved for use by agencies of the Department of Defense.

e1 NOTEThe introduction to the Appendix was editorially updated in April 2000.

1. Scope *

1.1 This specification covers gypsum wallboard which is

designed to be used for walls, ceilings, or partitions and affords

a surface suitable to receive decoration.

1.2 The values stated in either inch-pound or SI (metric)

units are to be regarded separately as standard. Within the text,

the SI units are shown in brackets. The values stated in each

system shall be used independent of the other. Values from thetwo systems shall not be combined.

1.3 The text of this standard references notes and footnotes

that provide explanatory material. These notes and footnotes

(excluding those in tables and figures) shall not be considered

as requirements of the standard.

2. Referenced Documents

2.1 ASTM Standards:

C 11 Terminology Relating to Gypsum and Related Build-

ing Materials and Systems2

C 473 Test Methods for Physical Testing of Gypsum Panel

Products2

C 645 Specification for Nonstructural Steel Framing Mem-bers2

C 1264 Specification for Sampling, Inspection, Rejection,

Certification, Packaging, Marking, Shipping, Handling,

and Storage of Gypsum Board2

E 84 Test Method for Surface Burning Characteristics of

Building Materials3

E 96 Test Methods for Water Vapor Transmission of Mate-

rials4

E 119 Test Methods for Fire Tests of Building Construction

and Materials3

3. Terminology

3.1 Definitions of terms shall be in accordance with Termi-

nology C 11.

4. Materials and Manufacture

4.1 Gypsum wallboard shall consist of a noncombustible

core, essentially gypsum, surfaced with paper bonded to the

core.4.2 Foil-backed gypsum wallboard shall consist of gypsum

wallboard with a layer of aluminum foil laminated to the back

surface.

4.3 Gypsum wallboard, type X (special fire-resistant) des-

ignates gypsum wallboard complying with this specification

that provides not less than 1 h fire-resistance for boards 58in.

[15.9 mm] thick or 34h fire-resistance for boards 12in. [12.7

mm] thick, applied parallel with and on each side of load

bearing 2 3 4 wood studs spaced 16 in. [406 mm] o.c. with 6d

coated nails, 178in. [48 mm] long, 0.0915 in. [2.32 mm]

diameter shank, 14 in. [6.4 mm] diameter heads, spaced 7 in.

[178 mm] o.c. with wallboard joints staggered 16 in. [406 mm]

on each side of the partition and tested in accordance with therequirements of Test Method E 119.

NOTE 1Consult producers for independent test data on assembly

details and fire resistance classifications for other types of construction.

See official fire test reports for assembly particulars, materials, and

classifications.

4.4 Gypsum wallboard shall have a flame spread index of

not more than 25 when tested in accordance with Test Method

E 84.

5. Physical Properties

5.1 Specimens shall be taken from the samples obtained in

accordance with Specification C 1264.

5.2 Specimens shall be tested in accordance with TestMethods C 473.

5.2.1 Flexural StrengthThe specimens shall be tested face

up and face down. The average breaking load shall be not less

than the following:

1 This specification is under the jurisdiction of ASTM Committee C-11 on

Gypsum and Related Building Materials and Systems and is the direct responsibilityof Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.

Current edition approved Oct. 10, 1999. Published December 1999. Originally

published as C 36 21 T. Last previous edition C 36 97.2 Annual Book of ASTM Standards, Vol 04.01.3 Annual Book of ASTM Standards, Vol 04.07.4 Annual Book of ASTM Standards, Vol 04.06.

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*A Summary of Changes section appears at the end of this standard.

Copyright ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.

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Thickness,in. [mm]

Method A Method B

Load, lbf [N]

Bearing EdgesAcross Fiber

of Surfacing

Load, lbf [N]

Bearing EdgesParallel to

Fiber ofSurfacing

Load, lbf [N]

Bearing EdgesAcross Fiber

of Surfacing

Load, lbf [N]

Bearing EdgesParallel to

Fiber ofSurfacing

14 [6.4] 50 [222] 20 [89] 46 [205] 16 [71]516 [7.9] 65 [289] 25 [111] 62 [276] 21 [93]38 [9.5] 80 [356] 30 [133] 77 [343] 26 [116]12 [12.7] 110 [489] 40 [178] 107 [476] 36 [160]58 [15.9] 150 [667] 50 [222] 147 [654] 46 [205]34 [19.0] 170 [756] 60 [267] 167 [743] 56 [249]

5.2.2 Humidified DeflectionThe specimens shall have an

average deflection of not more than the following:

Thickness,in. [mm]

Humidified Deflection,Eighths of an inch [mm]

14 [6.4] not applicable516 [7.9] not applicable38 [9.5] 15 [48]12 [12.7] 10 [32]58 [15.9] 5 [16]34 [19.0] 5 [16]

5.2.3 Core, End, and Edge HardnessThe specimens shall

have an average hardness of not less than 15 lbf [67 N] whentested by Method A and 11 lbf [49 N] when tested by Method

B.

5.2.4 Nail Pull ResistanceThe specimen shall have an

average nail-pull resistance of not less than the following:

Thickness,

in. [mm]

Method A

Nail PullResistance, lbf [N]

Method B

Nail PullResistance, lbf (N]

14 [6.4] 40 [180] 36 [160]516 [7.9] 50 [220] 46 [200]38 [9.5] 60 [270] 56 [250]12 [12.7] 80 [360] 77 [340]58 [15.9] 90 [400] 87 [390]34 [19.0] 100 [440] 97 [430]

5.3 Foil-Backed Gypsum Wallboard:

5.3.1 Foil-backed gypsum wallboard shall meet all of the

requirements for gypsum wallboard.

5.3.2 When tested in accordance with Test Method E 96, the

permeance of foil-backed gypsum wallboard shall be not more

than 0.30 perm [17 ng/Pasm2] (Desiccant Method) for the

condition of 50 % relative humidity on the face of the board

and 0 % relative humidity on the foil-covered back side of the

board.

6. Dimensions and Tolerances

6.1 Specimens shall be taken from the samples obtained in

accordance with Specification C 1264.

6.2 Thickness, width, length, and end squareness shall be

determined in accordance with Test Methods C 473.

6.2.1 ThicknessThe nominal thickness shall

be 14, 516, 38, 12, 58, 34in. [6.4, 7.9, 9.5, 12.7, 15.9, 19.0 mm]

with tolerances in the nominal thickness of6 164in. [0.4 mm]

with local variations of6 132 in. [0.8 mm] from the nominal

thickness.

6.2.2 WidthThe nominal width shall be up to 48 in. [1220

mm], or up to 54 in. [1370 mm], with a tolerance of 332in. [3

mm] under the specified width.

6.2.3 LengthThe nominal length and tolerance shall be as

follows:

Thickness

in. [mm]

Length

ft. [mm]

Variation

in. [mm]14 [6.4] 4 to 12 [1220 to 3660] 614 [6]516 [7.9] 4 to 14 [1220 to 4270] 614 [6]38 [9.5] 4 to 16 [1220 to 4880] 614 [6]12 [12.7] 4 to 16 [1220 to 4880] 614 [6]58 [15.9] 4 to 16 [1220 to 4880] 614 [6]34 [19.0] 4 to 16 [1220 to 4880] 614 [6]

6.2.4 Tapered Edge DepthThe average thickness of the

edge of recessed or tapered edge shall be not less than 0.020 in.

[0.51 mm] but not more than 0.090 in. [2.29 mm] less than the

average thickness of the gypsum wallboard.

6.2.5 End SquarenessCorners shall be square with a

tolerance of6 18 in. [3 mm] in the full width of the board.

6.3 Edges and EndsThe edges and ends shall be straight

and either square, recessed, beveled, featured, tapered, or

featured and tapered.

7. Finish and Appearance

7.1 The surfaces of gypsum wallboard shall be true and free

from imperfections that render the gypsum wallboard unfit foruse with or without decoration.

8. Sampling, Inspection, Rejection, Certification,

Packaging, Marking, Shipping, Handling and Storage

8.1 Shall be in accordance with Specification C 1264.

9. Keywords

9.1 ceiling; foil-backed; gypsum; gypsum wallboard; gyp-

sum wallboard, type X; partitions; wall

C 36/C 36M

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APPENDIX

(Nonmandatory Information)

This Appendix gives general information and also suggestions for inclusions to be made elsewhere by the specifier. They are

not part of this specification.

The definition of type X as given in 4.3 and the alternate definition given in this appendix, are intended only as a test todefine the gypsum board as meeting the requirements of type X. These tests do not indicate a preferred application nor do

they limit the use of the product in other fire rated assemblies.

All gypsum panel products except lath use the same test for type X products, therefore the type X designation indicates a

consistent level of fire resistance.

X1. ALTERNATE DEFINITION FOR TYPE X

X1.1 Gypsum wallboard, type X (special fire-resistant)

designates gypsum wallboard providing a greater fire resis-

tance than regular gypsum wallboard of the same thickness.

Type X (special fire-resistant) gypsum wallboard, when tested

in accordance with Test Methods E 119, shall provide thefollowing minimum fire resistance for the assemblies de-

scribed:

X1.1.1 One h for a 58in. [15.9 mm] thickness applied to a

partition in a single layer application on each side of 358in. [92

mm] deep non-loadbearing galvanized steel studs complying

with Specification C 645, spaced 24 in. [610 mm] on center.

The 58in. [15.9 mm] thick gypsum wallboard 48 in. [1220

mm] wide shall be attached using 1 in. [25 mm] long drywall

screws spaced 8 in. [203 mm] on center along the edges and

ends, and 12 in. [305 mm] along intermediate studs. All joints

shall be oriented parallel to and located over studs and

staggered on opposite sides of the assembly, and,

X1.1.2 Two hours for a 12in. [12.7 mm] thickness applied

to a partition in a double layer application on each side of

212in. [64 mm] deep non-loadbearing galvanized steel studs

complying with Specification C 645, spaced 24 in. [610 mm]

on center. The 48 in. [1220 mm] wide base layer shall be

attached using 1 in. [25 mm] long drywall screws spaced 12 in.

[305 mm] on center along board edges, ends, and along

intermediate studs. Joints shall be oriented parallel to and

located over studs and staggered on opposite sides of the

assembly. The 48 in. [1220 mm] wide face layer shall be

attached using 158in. [41 mm] long drywall screws spaced 12

in. [305 mm] along board edges, ends, and along intermediate

studs. Joints shall be oriented parallel to and located over studs,

offset 24 in. [610 mm] from the base layer joints, and staggered

on opposite sides of the assembly.

SUMMARY OF CHANGES

Committee C-11 has identified the location of selected changes to this standard since the last issue, C 3697,

that may impact the use of this standard.

(1) Converted Specification to dual standards.

(2) Add reference to C 1264.

(3) Add Shipping, Handling and Storage Section.

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with any item mentioned in this standard. Users of this standard are expressly advised that determination of the validity of any suchpatent rights, and the risk of infringement of such rights, are entirely their own responsibility.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and

if not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM Headquarters. Your comments will receive careful consideration at a meeting of the responsible

technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make yourviews known to the ASTM Committee on Standards, at the address shown below.

This standard is copyrighted by ASTM, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the above address or at

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C 36/C 36M

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